#include <key.H>


unsigned char key_read()
{
unsigned char trmp = 0;
P44=0;P42=1;P35=1;P34=1;
if(P33==0)	trmp = 4;
if(P32==0)	trmp = 5;
if(P31==0)	trmp = 6;
if(P30==0)	trmp = 7;
return trmp;
}
	